Hi, I decided to check out a "S21" light as sold on ebay and it must be similar to the one being discussed. On the side it says "Manta Ray" and S21. Not a bad light for $22.28 shipped from China.
Battery Configurations: 1x21700 or 18650 3.7v, mine seems happy with a 18650.
Options: Luminus SST-20-W LED (6500K/5000K/4000K/3000K) - I ordered the 5000K which looks OK, has kind of blue/purple rings around the outside. Would have got the 4000K if I new what I know now. Emits a whine at the lower modes but I can only hear it close to my ear.
I also ordered a "Convoy S2 + Mit Luminus SST20 4000K Military Flashlight Hunting Tactical Torch" which looks similar and is cheaper after shipping, but it's not here yet.
-Dick Locke p.s. I'd post a picture but not able to, only a link? New to this forum so not sure what's up with that.
depend wich arrive later at 55°C
That mean it have better heat management
but yes they are very similar,apart pill S21A that I like much,hope to see this pill in copper for single and triple/quad.
I’ve seen solder wick broken so many times I won’t use it for a bypass, don’t even own any. I use Turnigy wires and always try to put a bit of a coil on them so they compress rather than bend.
I don’t like button contacts on the driver. I consider it much better to have springs at both ends of the light.
That way you don’t get a momentary disconnect if you drop the light on its tail and the cell pulls away from the driver button as it bounces on the tail spring. Those momentary disconnects create an unwanted mode change on lights with reverse clicky tail switches and a half-press mode change UI. Really annoying if your light just went from moonlight to turbo or vice versa.
Springs at both ends also help to prevent “cell hammer”, which is what happens after a really nasty drop where the tail spring propels the cell back into the driver with such force that the driver PCB cracks and kills the driver.
Spring bypasses with multi-stranded flexible silicone-insulated wire are the value option, and double springs (as you said) are the gold standard.
I was asking because I needed to illuminate dark basement while working for few hours, so I was thinking about putting the flashlight into glass of watter to keep it cold, so it could run on turbo for infinite time